But when you're an eighth-inning setup man coming in with the game on the line, one pitch can make all the difference.
"It's usually just the one pitch that gets me," Hernandez said. "That's the most frustrating part about being a reliever, it's usually just that one pitch that gets you. If I can try and eliminate those pitches..."
With that in mind, Hernandez is using his breaking ball more than he did last year.
"I'm just kind of tired of getting beat with my fastball, I guess," Hernandez said. "I just feel like I have to throw it and change it up a little bit. One of the reasons I'm throwing my breaking ball more is because I feel like it's a tougher pitch to hit out."
The D-backs were ahead, 2-1, when Hernandez came on to face the Marlins in the eighth inning last weekend in Miami.
After Hernandez fell behind in the count 2-1, he threw a 95-mph fastball that Logan Morrison hit over the wall in right to tie the game.
Hernandez then settled in to strike out the next three hitters.
"It's even worse when you give up the home run and then you strike out the next three guys," Hernandez said. "It just reaffirms to me that I do have the stuff. It's just trying to eliminate that one pitch."